Bathtub



FIG. 1 is a perspective view taken from the top and front of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a cross-sectional view taken on line 3--3 of FIG. 2; and,

FIG. 4 is a cross-sectional view taken on line 4--4 of FIG. 2. 

The ornamental design for a bathtub, as shown and described. 